I think that nobody understood what exactly is, that you want to do.
Do you use IE to access web pages, and you left click on a link and it opens in a different window?
And you want to left click on it, so it will open in the same window?
Or you use an application (a no broswer) and there are links in this application, so when you first press on a link it opens an IE window, and then on a second link, it opens a different IE window, instead of the one that was already open?
Did i made my self clear?
``The wise man doesn't give the right answers,
he poses the right questions.''
TIMTOWTDI